With PHPFog (blog and Facebook), you can move your service to Amazon, Rackspace, Microsoft Windows Azure, or the HP Cloud, with the click of a button. It makes tweaking cloud servers, databases and storage faster and easier by abstracting away all of the complexity below the application tier.

The Portland, Ore.-based company added support for Java, .NET, and Node and other popular languages, using standardize Cloud Foundry technology.

Cloud Foundry is a cloud-based, open source (PaaS) software tool developed by VMware, and released under the terms of the Apache License 2.0. It is primarily written in Ruby. The source and development community for this software is available at cloudfoundry.org

Since January 2011, AppFog has provided approximately 10TB of RAM for free during its private beta to over 40,000 developers who have built more than 50,000 applications.

“Today we are in the early Hotmail days of PaaS with all the leading providers giving the equivalent of 15MB of space to run apps,” said Lucas Carlson, founder and CEO of AppFog. “AppFog is doing to PaaS what Google did to email. We are giving developers 2GB of RAM for free to use any way they want, such as scaling their app with dozens of load balanced instances or running it across multiple infrastructures.”